package com.neu.cpspgateway.util;

import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTCreator;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.interfaces.DecodedJWT;

import java.util.Calendar;
import java.util.Map;

public class JWTUtils {

    private static final String SING = "1q2w3e4r?`a3f6:3j[]";

    /**
     * 生成token header.payload.sing
     */
    public static String getToken(Map<String, String> map){
        Calendar instance = Calendar.getInstance();
        instance.add(Calendar.DATE, 3); //默认3天过期

        JWTCreator.Builder builder = JWT.create();

        //payload
        map.forEach((k, v) -> {
            builder.withClaim(k, v);
        });

        String token = builder.withExpiresAt(instance.getTime())  //指定过期时间
                .sign(Algorithm.HMAC256(SING));  //sign

        return token;
    }

    /**
     * 验证token
     */
    public static DecodedJWT verify(String token){
        return JWT.require(Algorithm.HMAC256(SING)).build().verify(token);
    }
}
